Ewanella Naskrecki, 1994

Gorochov, Andrej V., 2009, Katydids of the genus Ewanella and of the subgenus Megalotheca (Orthoptera: Tettigoniidae), African Invertebrates 50 (2), pp. 435-435 : 435-436

Genus Ewanella Naskrecki, 1994

Type species: E. longipes Naskrecki, 1994 ( South Africa: Richtersveld ) .

Remarks: This genus differs from the most similar genus Aprosphylus Pictet, 1888 in the characters previously indicated by Naskrecki (smaller size, less spotted coloration of wings, shorter pronotum), but mainly in: the almost complete absence of a hind lobe of the pronotum (which covers small basal areas of the tegmina in Aprosphylus ); characteristic tegmina distinctly narrowing in the distal half (in Aprosphylus , tegmina with the distal half and proximal half of almost equal width, except for a widened region of the male stridulatory apparatus); a distinctly inflated proximal half of the middle tibiae; the presence of 2 pairs of small spines at the apex of the hind femora (in Aprosphylus , these femora have only a ventral pair of apical spines); and a more or less truncate or notched hind part of the female genital plate (in Aprosphylus , this plate is triangular).

Species included: Type species and E. breviuscula sp. n.

Key to species of Ewanella

1 Male tegmina longer (ratio tegmen/hind femur about 0.95); mirror in stridulatory apparatus of lower (right) tegmen of male with convex lateral edge and narrower distal part ( Fig. 1 : m); stridulatory vein of upper (left) tegmen of male with about 46 stridulatory teeth; male cerci with longer hook situated near cercal apex ( Fig. 2 ); male genital plate with deep apical notch ( Fig. 3 ). Female genital plate with almost truncate hind part ( Fig. 4 ) ............................. E. longipes Naskrecki, 1994

– Male tegmina shorter (ratio tegmen /hind femur 0.75–0.8); mirror in stridulatory apparatus of lower (right) tegmen of male with straight lateral edge and wider distal part ( Fig. 5 : m); stridulatory vein of upper (left) tegmen of male with 37–41 stridulatory teeth; male cerci with shorter hook situated somewhat farther from cercal apex ( Fig. 6 ); male genital plate with less deep apical notch ( Fig. 7 ). Female genital plate distally rounded and with distinct apical notch ( Fig. 8 )................................. .............................................................................................. E. breviuscula sp. n.

Figures

Figs 1–8. Species of Ewanella: (1–4) E. longipes [after Naskrecki (1994) and Eades & Otte (2009)], stridulatory apparatus of male right tegmen (1), male cercus ventrally (2), male genital plate ventrally (3), female genital plate ventrally (4); (5–8) E. breviuscula sp. n., stridulatory apparatus of male right tegmen (5), male cercus ventrally (6), male genital plate ventrally (7), female genital plate ventrally (8). Abbreviations: (a) area between M and CuA, (b) area between place of basal articulation and sclerite ‘s’, (m) mirror, (s) thick sclerite of basal part.